
@Chatz13, regarding your question about memory cleanup - maybe these links will help you:
iPhone: https://support.apple.com/de-de/HT201656
Android phone: https://support.google.com/android/answer/7431795?hl=de
Kind regards, CorinaS
Basically, it is important to generate as little data waste as possible. You can remove apps that you no longer need by long-clicking on the corresponding icon.
However, you can only completely free a device from data waste by performing a factory reset. Then you only reinstall the apps you really need. This method is very time-consuming but the most effective. Before that, you have to back up the data that you still need.